The pollution zones in the river are divided into how many types?
Explanation: There are 4 types of pollution zones in the river, namely zone of degradation, zone of active decomposition, zone of recovery and zone of clear water.
In which pollution zone of river, growth of algae reappear?
Explanation: The growth of algae reappear in the zone of recovery.The growth of fungi decreases.
In which pollution zone of the river, the dissolved oxygen reduced to 0?
Explanation: The dissolved oxygen, reduced to 0 in the zone of active decomposition. The water is highly polluted in this zone.
Which is the third zone of pollution in the river?
Explanation: The zone of recovery is the third zone of pollution in the river where river tries to recover the polluted water through the self purification process.
In which pollution zone of the river, water retains its original dissolved oxygen concentration?
Explanation: The water retains its original dissolved oxygen concentration in the zone of clean water. It has a clear appearance.